If you are seeing
Unpacking the package… Installing the theme… The package could not be installed. The theme is missing the style.css stylesheet. Theme installation failed.
error when trying to upload your theme to WordPress, that means you are uploading wrong .zip file.
The correct file that needs to be downloaded from MOJO Marketplace is “Main File”.
After downloading it, log into your WordPress Dashboard and go to Appearance » Themes and click on the Upload button. Then, upload the downloaded file and click “Install”.
For more detailed instructions please read MOJO Marketplace instructions on how to install your WordPress theme.